How hard are they to keep? Compared to my freshwater fish (Mostly Characins and Rays) they are rediculously easy to keep. I spend the same amount of time once a week on this tank as I spend once a DAY on the rays.
I've only ever lost 2 eels. One lived about 8 years (was fed a lot of goldfish when younger) and they other didn't make an 8 hour drive.
Eels are VERY VERY hardy fish, VERY simple to keep, and best of all DO NOT consume a bunch of your time. Best of all feeding time is one of the most impressive sights you can possibly see in an aquarium.